Knife-jointer for the bottom cutter-heads of wood-planers.



No. 874,355. l PAT'EN'TBD 1330.17, 1907. o. w. H. BLOOD az o. G. os'rEMAN. KNIFE JoxN'rBR PoR THB BOT-TOM GUTTER HEADS or woon PLANBRS.

APPLICATION FILED 00T.15, 1906.

I 2 BEETB-BHBET 1.

marks MIK.' @rl Gf. 0.5 'QV No. ammi.A PATBNTBD 13110.17. 19o?.

o. w., n. BLooD a o. e. osTBMAN. v KNIFE WINTER Pon THB BOTTOM GUTTER HEADS or woon PLANERs.

APPLIUATIOI FILED 001.16, 1006.

2 SHEETS-SHEET 2.

New.

UNITED STATES PATENT OFFICE.

CHARLES -W. H. BLOOD AND CARL G. OSTEMAN, OF BOSTON, MASSACHUSETTS, ASSIGNORS TO S. A. WOODS MACHINE COMPANY, OF BOSTON, MASSACHUSETTS.

Specification of Letters Patent.

Patented Dec. 17, 1907.

Application filed October 15. 1906- Berial No. 838.964.

To all whom 'it may concern:

Be it know that we, CiiA'RLEs W. H. Bacon and CARL G. OSTEMAN, citizensof the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented an Improvement in Knife-Jointers for the Bottom Cutter-Heads of Wood-Planers, of which the following description, in connection with the accompanying drawings, is a specification, like letters in the drawings represeiitin like parts.

In high speed work suc as is required of the best grade of wood laners, modern requirements demand that t e work shall be smooth and that the lining or marking of the rapidi? rotating cutter knives on the wood shall )e eliminated. This is accomplished by what is called jointing the knives", and has heretofore been considered practicallyr impossible to accom lish, various expedients for settin and s arpening the knives in the cutter-hea having been proposed.

Our present invention accomplishes the desired object of jointing the knives or bringing their outtin edges into absolutely uniform alineinent, y (providing a heavy transverse guideway, a justed into absolutely correct position parallel to the line of desired cut, and a reciprocating sliarpener arranged to engage and sharpen the knives when the cutter-head is ruiming at top speed, thereby removing all variations and inaccuracies which may be due to the running of the cutter-head as well as those due to the movement or ini ierfections of mounting or adjustment of tlie knives, etc. We have found that in practice our mechanism secures the desired result.

The constructional details thereof will be fully ointed out in the course of the following iescription, -taken in connection with the accompanying drawings and the invention will be further defined in the appended claims.

In the drawings, Figure 1 is a top plan view of a portion of a wood planer provided with our invention, Fig. 2 is a transverse scctional'view showing various details of our attachment in end elevation; Fig. 3 is a top plan view of the sharpening or grinding attachment which we prefer to employ; Fig. 4 shows the emery holder in top plan; Fig. 5 is an edge view ofthe supporting plate or carrier for the emerv holder looking at the right-hand side f Fig. 3; l ig. (i is n view similar to Fig. 4, showing the parts in side elevation; and Fig. 7 is a sectional view showine the Urinding attachment in end elevation. lIt wiil be understood that the bottom cutter-head 1 and its knives 2 and carrier 3, mounted in the bed 4 of the wood planer, may be of any usual or preferred construction, as, in fact, may be the entire wood planer, the to rotary cutter being indicated at journale at 6 in a vertically adjustable carrier 7 and provided with a usual overhanging top p ate 8 for holding the work against the bottom cutter-head. The work is guided by a long side bar 9, which may be of usual construction, being herein shown as adjustably secured at 10 to a laterally adinstable block 11 supported in the bed 4.

In carrying out our invention we provide a transverse bottoni guide bar 12 dove-tailed in cross-section as clearly shown in Figs.2 and 7, and rovidedwith slotsI 13 for adjustment on bo ts 14 toward and from the cutterhead, and provided with oblique bolts 15 for bearing against shoulders 16 in the bed for permitting the bar 12 to be brought into absolutely accurate parallelism with the cutterhead. The guiding surfaces of this bar are trued with the utmost accuracy, so as to guide the frinding attachment exactl as required. his guide-way is normally protected opposite the bottoni cutter-head by suitable means, herein shown as the barafter-the-cut 17, which is normally held fast by set bolts 18 capable of being loosened for permitting said bar 17 to be adjusted lengthwise of the guide bar 12. On the bar 12 is mounted a grinder carriage consisting of a sliding base plate 19 having an obliquely dependin edge 2O fitting accurately against the adjacent dove-tailed way 12 am provided at its opposite end with an oblique edge I21 against which is retained a sustaining gib 22 by screws 23. Projecting from the upper side of this plate 19 is an integral block 24 having a dove-tailed slide-way 25 set to extend obliquely forward and downward, as clearly shown in Figs. 3 and 5, for receiving an enierv holder 26, shown best in Figs. 3, 4 and 7, having a recess 27 extending lengthwise thereof and preferably rough-v ened, as indicated at 28, to hold a stick of eniery 29 clamped in place by an adjustable plate 30. Sai holder 26 bears against a wear plate or gib 31 at one edge, and is longitudinally adjustable by a thumb screw 32 CII having its inner end threaded into a boss or rojection 33 of the block 24, all possible ost motion or looseness being prevented by a spring or other suitable means 34 bearing between said boss 33 and an ear 35 of the holder 26 in which said screw 32 is mounted. At its forward end the sliding base plate 19 has a notch or recess 36 for snugly receiving the projecting down-turned end 37 of an operating handle or arm 38 provided at its outer end with a hand-hold 39.l

We have described our preferred mechanism in all its constructional details in order that the Sallie may be thoroughly understood, but we do not intend to limit our invention to these constructional details, as will be apparent from certain of the claims, where our invention is broadly defined.

In use, the planer is set in operation at high speed, and when the cutter-head has attained its top speed and normal movement, the operator inserts the actuator 3S in the grinding carriage and shoves said carriage back past the bottom cutter-head, the bar 17 having first been loosened so that it is shoved forward out of interference with the grinding carriage. The operator carefully adjusts the grinding edge of the emery 29 until it is brought into the correct arc or path of movement of the cutting edges of the respective knives 2 of the cutter-head 1. He then-continues to move the carriage back and forth until the knives are all brought into absolutely the same path of rotation. The operator performs this same operation whenever he notices that the machine is not giving smooth work. By havin the emerv or other grinding material set ob iquely wit i its forward end extending forwardly and downwardlyT and mounted low down on the machine, the knives of the bottom cutterhead may be readily and accurately jointed, even though the machine is operating on very thin stock, as the forwardly and downwardly projecting end of the stick of emery or other grinding material can readily project under the top head construction without disturbing the adjustment of the same and can run under the long guide t).

In Fig. 2 the overhanging head plate S of the upper cutter-head 5 and its carriage 7 is shown as adjusted down close to the barafter-the-eut 17 for holding thin stock in proper position, and the obli( ue arrangement of my Sharpener as best s iown in Fig. 7, enables the operator readily to true the knives 2 when said head plate is adjusted down thus for thin stock.

By haying the grinding carriage operate in connection with the bar-after-the-eut 17 the transverse way 12 is protected'at all times from dirt, pitch or other substances which would otherwise interfere with accuragof grinding.

iile we prefer to provide the grinding t so that, when running at top speed, they will 13e carriage separate from the bar 17, as this construction has many points of decided advantage, the grinder mav in some instances be formed as a part of the bar 17. Among the advantages of having the grinder used in connection with the bar 17 is that we get a low down location at a point where the bar 12 or guideway for the grinder can be adjusted readily and with extreme accuracy into permanent )arallelism with the bottom cutter-head, sai guideway may readily be protected from all extraneous and injurious substances which would interfere with the pro )er movement and delicacy of operation of t e grinding carriage, and the latter may at the same time be left at one end of said Uuideway ready for instant use and yet not 1n the way of the operator or of the work. lf the emery is mounted on the end of the bar 17 the construction is less convenient, and therefore we prefer to provide. an independent carriage 19 as explained.

It will be understood that the. grinding 'effect of the'sharpening ap iaratus is usually exceedingly slight., as the ellection or inaccuracy oli alinement in the cutterhead knives which causes the lining or almost imperce tible marking of the work (which it is the o )ject of our invention to overcome and render smooth) is so slight that uually it cannot be discovered at alii when the cutterhead is not running. It is only by having perfect alinement of movement of t ie grindmg carria e and by moving the latter slowly back and orth and iermitting the perfectly 'adjusted forward end of the emery stick 2t) to just touch the edges of the cutters that the lnaccuracy of alinement of the latter can be detected and remedied. By having the emery in the form of a pencil 2t) and arranged to project obliquely downward and forward as shown, the operator is enabled to observe easily and critically the work, and also the sha1 )ening edge of thel emery` maintains itseli more readily true to a line edge and point. In this class of devices the running speed is exceedingly high, so that the grinding ell`ect is much dill'erent when the machine is under speed than it would be if the grinding took )lace with the cutter-head stationary. n fact, the high speed reduirements are such that. perfect work can only bc obtained by grinding the knives at top speed` and hence in order to enable the o erator to inspect with safety the. progress of the work lI have found it necessary to provide this means for maintaining as nearly as possible a grinding point as distinguished from a long and wide grindimr surface, and projecting said point forwardobliquely so that the operator can readily see the results and what. is

needed. But by our apparatus the operator can quickly and easily bring all the. cutter edges into perfect alinement with each other,

lll') wise on said bar, having a grinding sur ace engage and dress the work down to one and the same smooth plane.

We regard the location of the grinder and its relation to the rapidly rotating cutterhead as an important feature of our invention, because on account of this the required delicacy of detecting and grinding is made ossible with a degree of accuracy which we liave not been able to accomplish otherwise.

Having described our invention, what we claim as new and desire to secure by Letters Patent is,

1. A wood planer, comprising a bed, a bottom cutter-head mounted in said bed, a guide bar ixedly mounted transversely of the bed of the machine at one side of said cutter-head parallel to the axis thereof and below the path of the lumber being planed, longitudinally movable grinding means includinga carriage mounted to move len thprojecting in the path of movement of the cutter-head knives, and means extending over the fuidin f surface of said bar normally in line with ani below said path of the lumber for protecting the guiding surface of said bar when the rindin means is not in use, and movable a ong said bar out of the way when the grinding means is operated.

2'. A wood laner, comprising a bed, a bottom cutteriead mounted in said bed, a transverse guide bar extending transversely of the bed at. one side of the cutter-head a bar-after-the-cut for sup orting the lumber being planed, longitudiiia l f movable on said guide bar, said guide bar being longer than the cutter-head, a grinding carriage mounted on said guide bar and normally occupying a irojecting end thereof beyond the cutterlead at one end of said bar-after-the-cut and movable lengthwise of said bar in front of the ciitter-head when the latter is to be sharpened and the bar-after-the-cut has been slid out of the way on said guide bar, and a grinding device mounted on and movable with said carriage for reciprocation in the path of movement of the cutting edges of the cutter-head.

3. A wood planer, comprising a bottom cutter-head, a guideway mounted parallel thereto on the bed of the machine, a grinding carriage mounted to reciprocate on said bar, and a pencil-like grinding device mounted on said carriage and having its grinding oint extending obliquely downward towari said (sitter-head.

4. A wood planer, comprising a bottom cutter-head a guideway mounted parallel thereto on the bed of the machine, a grinding carriage mounted to reciprocate on said bar, and a pencil-like grinding device mounted on said carriage an( having its grinding point extending obliquoly forward and downward toward said cutter-head.

5. A wood planer, comprising a bottom l cutter-head and o iposite ovcrhanging head )late for guiding t e upper side of the work )eing dressed by said cutter-head, and a reci rocable grinding devicel mounted at one si( e of said cutter-head parallel thereto and movable into the path of movement of the 'cutting edges thereof beneath said overhanging head plate when the latter is adjusted down for thin stock.

6r A` wood planer, comprising a bottom cutter-head, a long guide extending lengthwise of the machine and over said cutterhead, and a transversely reciprocable grinding device movable longitudinally of said cutter-head in the path of movement of the cutting edges thereof, said grinding device having a )rejecting grinding surface. movable beneath said long guideavhen said grinding device is reciprocated during the operation of the machine.

7. The combination with a bottom cutterhead and a transverse guide bar close'and parallel to said cutter-head, of a grinding carriage consisting of a sliding base plate having longitudinal ways on its under side to travel lengthwise of said guide bar, a block projecting from its uppenside containing a slide way extending obliquely downward transversely of the base plate, an einery holder fitting said obli ue transverse slide way, havin a recess an( clam ing means for removabil'y holding a stick o emery, and means for accurately adjusting said emery holder and emery forward and backward in said slide way.

8. The combination with a bottom cutterhead and a transverse guide bar close and parallel to said cutter-head, of a grinding carria-ge consisting of a sliding base plate having longitudinal ways on its under side to travel lengthwise of said guide bar, a block projecting from its u per side containing a slide way extending obliquely downward and forward transversely of the base plate and siibstantially coincident with the top edge of said late next to the cutter-head, an eincry iolder fitting said oblique transverse slide way, having a recess and clamping means for removably holding a stick of en'iery, and means for accurately adjusting said emery holder and einery forward and backward iii said slide way.

9. The combination with a bottom cutterhead and a transverse guide bar close and parallel to said cutter-head, of a grinding carriage consisting of a sliding base plate having longitudinal ways on its under side to travel lengthwise of said guide bar, a block projecting from its u )per side. containing a slide wav extending ob iquely downward transversely of the base plate, an emery holder fitting said oblique transverse slide way, having a rer-ess and clamping means for removably holding a stick of emery, and means for accurately adjusting said emery holder and emery forward and backward in said slide way consisting of a boss at one side ofsaid transverse slide way, an ear projecting from said holder to overhang the end of said boss, a thumb-screw operating through said car and threaded into said boss, and a spring carried by said screw, having its op )osito ends in engagement respectively wit i the boss and ear.

10. The combination with a bottom cutterhead and a transverse guide bar close and parallel to said cutter-head, of a grinding earriage consisting of a sliding base plate having longitudinal wavs on its under side to travel lengthwise of said guide bar, a block projecting from its u per side containing a slide way extending ob iquely downward transversely of the base plate, an emery holder fitting said oblique transverse slide way, the latter containinfr a removable wear plate overhanging one et ge of said holder for maintaining the latter in accurate position, said holder hav ing,r a longitudinal recess for receiving a stick of emery, an adjustable clam iin" plate overa han fing said recess close to die owcr cud of the iolder for clam )ing the lower end of the stick of emerv, and slow motion means for iositively adusting said holder toward and irom the cutter-head.

In testimony whereof, we have signed our names to this specification, in the presence of two subscribing witnesses.

CHARLES W. Il. BLOOD. CARL (l. ()S'I`IC.\IAN. Vitnesscs:

LESTER E. PRATT, EDMUND A. Ro'rnwaLL. 

